{
  "manageEntity": {
    "action": "Save",
    "entityId": "642475355",
    "entityType": "Track",
    "nonce": "0xf2e75797d4a31280509477303d396ba74c00ddcdeb5323b201f518c67332adac",
    "signature": "0x92209640af3c63b9ca7cad814b48a1527e06172332f4aa1617657220d187f2da061e4ca16f830f183b0a3777f5646cb18c44581d9e45ae42c10837480288392e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}